Anyway, the most interesting novelty of this board is the possibility to place an XBee module in the socket that incorporates specific for it. However, the USB connection is not intended for programming the microcontroller, so it is necessary to connect a USB-Serial adapter (such as those already commented when we saw the Arduino Ethernet board) to the holes on the board marked as GND, AREF, 3V3, RXI, TXO and DTR, by the pin string adequate. In fact, through the food received via USB, you can even recharge the LiPo battery that is connected to that moment since the board incorporates the MAX1555 charger chip from the manufacturer Maxim. The plate Arduino Fio can also be powered via USB connection since it has a USB mini-B connector for this. A novelty of this plate with respect to the previous ones is that it can be electrically powered by a LiPo battery thanks to the fact that the board has a 2-pin JST type socket to be able to connect it directly there. It has 14 holes that can be used (by direct welding or by welding plastic female-pin placement) as digital input/output pins (6 of which can be used as PWM output) it also has 8 holes ready to be used as analog inputs and a reset button, all within a very small size. This Arduino type board contains an ATmega328P running at 3.3V and 8MHz. Arduino types and datasheet-in this article I am going to show you different types of Arduino and its datasheet

Arduino uno mini r3 datasheet